<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>页面标题</title>
    <style type="text/css">
        h3, div, p, span {
            color: red;
        }
    </style>
</head>

<body>
    <h3>绿叶学习网</h3>
    <div>绿叶学习网</div>
    <p>绿叶学习网</p >
    <span>绿叶学习网</span>
</body>

</html>